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GEORGE MATTHEWMAN, OE BROOKLYN, NEW YORK..

Lettere .Patent No. 82,139, dated September 1 5, 1868.

IMPROVEMENT IN PRESSES.

TO ALL'WHOM Ir MAY OONOERN:

Be it known that I, GEORGE MATTHEWMA'N, of' Brooklyn, in the county ofKings, and State of New York,

have invented certain new and useful Improvements in Presses; and I dohereby declare the following is a full and exact description thereof.

My invention relates to provisions forv communicating a peculiar motionfrom the operating part or handlever to the pressing part or platen, andconsists in the employment of two toggles, arranged to operate, the oneupon the other, so as to effectthe motion in the manner set forth below.i

I will describe what I consider the best means of carrying out myinvention.

The accompanying drawings `form a part of this specication.

Figure 1 is a vertical section through my press, with the platen raised.

Figure 2 is a corresponding' section, with the platen depressed.

Similar letters of reference indicate like parts in all the figures.

Tints are employed merely to aid in distinguishing the parte, and do notimply diTerences of material. The Aniatt'erial of the whole may be ironand steel.

A is the bed and framework ofthe press,'adapted to stand upon the groundor floor, and firmly supportingY the several parts. l The upright framesa supportvcross-piveces, al a2, which serve as,guides for the rod 6,which may carry a platen, B, at its lower end, and is threaded throughthe cross-head so that, as the rod b is turned by a wrench applied atthe top, the platen may be operated at diiferent leveis. This modeofadjusting the level at which the press, rod, and platen work, is wellknown.

D is a bent link, connected at its upper end to the cross-head C by thepin c.

lE F is about lever, fixed on the stout rocking-shaft Gr, mounted inbearings in the framework A, in the l position represented.

The lower end of the stout link D, running down behind the press-frame,is pivoted to the arm E by the pin d, as represented. Turning the arm Edownward, into a perpendicular position, draws the cross-head C and itsconnections do'wn to their lowest position, and the'moveznent increasesin leverage or purchase as the movement proceeds.

The means whereby the turning-motion is communicated to the lever E areshown very plainly in gs. 1 and 2. These gnres being sectionsthrough themachine, near its centre, show the parte on one side'only cf the press,it being understood that the parts E D should be duplicated. l

H is a link, connecting the end of the arm F with the arm I, whichlatter is turned by the hand-lever J, the position being such as toallow a. convenient application of the muscular force to the end of thelever J, and to bring the arm I and the link H nearly lin a straightline at the time when the press is exerting its greatest force,'asindicated in red outline in fig. 2.

By examining iig. 1, it will be seen that when the platen is in itshighest position, the link H is not at right angles to the arm I, butthat it is considerably inclined in the opposite direction, and it willbe seen that when the hand-lever .I is operated to depress the platen,the platen moves rapidly and almost `uniformly during all the earlierportions of the movement, and that it moves slowly and with agreatly-increasing slowness, and consequently increased purchase, duringthe latter portion of the movement.A

The term toggle is one frequent-ly employed by mechanics to designate adevice for increasing mechanical eifect by oblique action, whether themotion be compressive or tensile. With this general definition of theterm ltogglc, we may say that my press contains two toggles, peculiarlyarranged, and acting the one upon the other.

The rapidity of the motion of the platen during the earlier movement ofthe hand-lever .I is due to the fact that neither of thc toggles is thenat or near its straightened position. The approximately uniform movementof the press-rod for a long period, is due to the fact that the link His not at right angles to the arm I at the commencement, that it comesinto right angles thereto after a portion of themovement, and that thereis a period, not at commencement of the movement, but after thehand-lever J has performed about half of its traverse, when the arms arein their best position for transmitting motion rapidly from the arm Ithrough the link H; This peculiar relation, .due to the Obliquity of thelinka H, when the platen is fullyraised, may be modified at willchanging the position ofthe central-K, where the arm I and `hand-lever Jturn. By moving this centre'K nearer to therooking-shaft Gr, thepress-rod b will be made to moveirelatively slower at the commencementof its stroke, and faster at the middle of its stroke. By moving thecentre K farther away from the rocking-shaft Gr, the press-rod b will bemade to move relatively faster at the commencement of the motion of thehand-lever J. The very great slowness ofthe movement of the press-rodduring-all ythe last part of the movementof thehand-lever J, is due tothe factthat there arein the press two toggles, both nearly'straight,Working one upon theother. This con-dition is indicated in iig.

The arm E, being nearly perpendicular, 'acte in the manner of a toggle'to draw down the cross-head with great purchase, while the arm I :in dthe link H, being in nearly straight line, each with the other, act onthe armF, being nearly at right angles with it, to turn it auditsconnections; with a very great'purehase.

My machine is capable of being m'odied in many of its details, withoutsacrificing all the advantages of the invention. It is important,`simply, that the parts be so relatedl that while there is adouble-toggle power, or tha-t of one toggle'acting upon another so as'to mnltiplythe' elfeet of one into that of the' other, at the point orperiod when the press is exerting its` greatest iforoe, there' shall be'such a relation of the levers and connections, during the early portionof the movement, that the inactionshall not be extremelyquick at thecommencement, andrapidly dying away, but shallbe nearly uniform duringthe main portion of the movement.

v With the proportions which I have tried, andk have endeavoredtorepresent in the iigures, the first four inches of the travel of lthehand-lever J give a motion tothe press-rod of one inch. The severalsucceeding increments, (of four inches'each lof motion of thehand-leven) give motions vto the press-rod b, as follows: One inch, oneinch,one'and one-'half inch, one and three-eighths inch, 'one inch,one-half inch, one-eighth inch; the total travel of 'the press-rod beingseven and one-half inches, and the whole distance the'hendle travelsbeing thirty-two inches. A

Having now fully described my invention, what I claim as new, and desireto secure by Letters Patent, is as follows `Operating. the press throughthe instrumentality of two toggles arranged as represented, that is tosay, the arm I'operati-ng the arm F' through the link-H, presenting theseveral `zingt-liar relations at the different periods, as specified,and the motion thus transmitted being lconveyed to 'the press-rod b, andits connectionsthrough' the medium of the arms'E and links D, forming asecond toggle, all substantially asland for the purposes herein setforth. f

GEORGE MATTHEWMAN. Witnesses:

THOMAS D. SrETsoN, s C. G. LrvlNes.

